Answer: Amount of ATP and NADPH produced (cyclic makes only ATP; non-cyclic makes ATP + NADPH + O 2 ).
- A Amount of ATP and NADPH produced (cyclic makes only ATP; non-cyclic makes ATP + NADPH + O<sub>2</sub>)
- B The specific wavelength of light absorbed by the reaction center pigments specifically
- C The total amount of carbon dioxide that becomes fixed directly during each separate pathway
- D The type of chlorophyll molecule, a or b, used specifically within each photosystem complex
Correct answer: A. Amount of ATP and NADPH produced (cyclic makes only ATP; non-cyclic makes ATP + NADPH + O<sub>2</sub>)
Explanation: Cyclic photophosphorylation (PS I only): produces ATP only. Non-cyclic (PS II + PS I): produces ATP + NADPH, and water is oxidized releasing O<sub>2</sub>.
Simplified photosynthesis diagram: light energy, CO2, and H2O enter the leaf and are converted in the chloroplast into glucose and O2.
Concept context
Light reactions, the Calvin cycle, C 3 /C 4 /CAM pathways, photorespiration, and factors affecting the rate of photosynthesis. One of the highest-yield NEET chapters.